Inside A Circuit Breaker With MikesElectricStuff | 220v Contactor Relay

The likely hazards identified, what are you about to do with it? Are you just opening it for curiosity’s sake, are you going to work on the high voltage circuit to fix it, or is it surplus that you’re scavenging for parts? If you’re just curious or simply scavenging parts, you may not have to increase the risk by applying power in the first place, so what other risks might remain?

I’m a bit spoiled as far as AC load SSRs go, since I get IDEC and Omron puck SSRs from obsolete equipment at work, but always exercise due caution when I have to go shopping for DC load SSRs. Far too much fake stuff out there, masquerading as reputable brands, some to the point of ruining the reputation of the brand. (Fotek… For the longest time I thought they were only a Chinese brand, like the various Harbor Freight “brands” that they slap on their junk tooling offerings.)

I’ve been bit in a big way only three times. Two of the three were “Trust but don’t verify” issues, and I learned from them – always verify, no matter what anyone says.

Hey [Martin] I think you deserve some recognition for your contribution here tonight (or whatever time it is for you).

ead of single layer traces covered by the paint, what about multilayer PCB? So the traces would be embedded between two FR4. This way it would be safer.

When potential EV adopters ask me how long it takes to charge my i3 I don’t have to say “ugh… like 22 hours for a full charge…” Instead I get a much different reaction by saying: “after a normal day of use I plug in my cell phone and my car at the same time and usually the car gets to 100% first… but DC fast charging stations can go substantially faster”

132KV is probably safer if you don’t test it with the back of your hand. It’s not like those little neon screwdrivers are expensive. You’d think in electrician training they’d have taught him about electrocution.

I’m not remotely an experienced sports shooter, so I can have trouble tracking fast-moving subjects under the best of circumstances. Already finding tracking fast action closely challenging, I found tracking fast action closely based on a series of static images delayed by 1/10 second or more was quite a bit harder still. After a little practice, I got better at doing so, but I sometimes found myself resorting to tricks like keeping both eyes open while shooting, or shooting in short bursts and using the time between bursts to get the subject properly framed with full-time live view again.

Watch this space, then: this is a super-competitive class that already offers something appealing for every taste. However, the Corolla is both very good and, thanks to its hybrid powertrain and dynamic leaning, different. At the right price and in the right spec, if it meets your priorities it could be exceptional.

As with many other types of electronic devices these days, you can buy a “smart” EV charging unit that includes Wi-Fi connectivity. While this adds cost and complexity to what’s otherwise a plug-and-play device, choosing a smart charger adds a layer of convenience. These units allow an owner to use his or her smartphone to monitor charging, and how much energy the vehicle is using to help gauge running costs. Some smart chargers can communicate with your power company to only charge at off-peak times for discounted rates, and even receive commands via Amazon’s Alexa virtual assistant.

The UMC equipment included with the Model 3 LR can supply up to 32 amps. That’ll charge at a bit over 30 miles an hour.

– Use isolated differential probes to measure high voltage. – Use current clamps or current transformers to measure current. – Put bleeding resistors in any big capacitor in your circuit. – Don’t change the position of the probes in the power circuit without power everything down. – Don’t work with high voltages alone. – If there’s more people involved in your experiment, block any circuit breaker, button or at least put some signs to prevent people from turning them on while you are messing with the circuit. Paranoids may even ground things while they are playing with the installation to direct the current to the ground in case someone makes a mistake.